I had a set of 225-45-17's Hankook Ice Bears on my Passats standard wheels last year. I didn't really get chance to try them in the snow, but even on cold, greasy winter B roads, they felt so much secure than the Michelin PS3's that had come off. Well worth having in my opinion.
I have just bought a set of very cheap Audi S line wheels, that are away being refurbed and powder coated anthracite at the moment. The winter tyres will be going on them, which will make swapping from summer to winter tyres much easier.